You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
136 lines
4.1 KiB
136 lines
4.1 KiB
.TH "LIGHTNING-GETROUTE" "7" "" "" "lightning-getroute"
|
|
.SH NAME
|
|
lightning-getroute - Command for routing a payment (low-level)
|
|
.SH SYNOPSIS
|
|
|
|
\fBgetroute\fR \fIid\fR \fImsatoshi\fR \fIriskfactor\fR [\fIcltv\fR] [\fIfromid\fR]
|
|
[\fIfuzzpercent\fR] [\fIexclude\fR] [\fImaxhops\fR]
|
|
|
|
.SH DESCRIPTION
|
|
|
|
The \fBgetroute\fR RPC command attempts to find the best route for the
|
|
payment of \fImsatoshi\fR to lightning node \fIid\fR, such that the payment will
|
|
arrive at \fIid\fR with \fIcltv\fR-blocks to spare (default 9)\.
|
|
|
|
|
|
\fImsatoshi\fR is in millisatoshi precision; it can be a whole number, or a
|
|
whole number ending in \fImsat\fR or \fIsat\fR, or a number with three decimal
|
|
places ending in \fIsat\fR, or a number with 1 to 11 decimal places ending
|
|
in \fIbtc\fR\.
|
|
|
|
|
|
There are two considerations for how good a route is: how low the fees
|
|
are, and how long your payment will get stuck in a delayed output if a
|
|
node goes down during the process\. The \fIriskfactor\fR floating-point field
|
|
controls this tradeoff; it is the annual cost of your funds being stuck
|
|
(as a percentage)\.
|
|
|
|
|
|
For example, if you thought the convenience of keeping your funds liquid
|
|
(not stuck) was worth 20% per annum interest, \fIriskfactor\fR would be 20\.
|
|
|
|
|
|
If you didn’t care about risk, \fIriskfactor\fR would be zero\.
|
|
|
|
|
|
\fIfromid\fR is the node to start the route from: default is this node\.
|
|
|
|
|
|
The \fIfuzzpercent\fR is a positive floating-point number, representing a
|
|
percentage of the actual fee\. The \fIfuzzpercent\fR is used to distort
|
|
computed fees along each channel, to provide some randomization to the
|
|
route generated\. 0\.0 means the exact fee of that channel is used, while
|
|
100\.0 means the fee used might be from 0 to twice the actual fee\. The
|
|
default is 5\.0, or up to 5% fee distortion\.
|
|
|
|
|
|
\fIexclude\fR is a JSON array of short-channel-id/direction (e\.g\. [
|
|
"564334x877x1/0", "564195x1292x0/1" ]) or node-id which should be excluded
|
|
from consideration for routing\. The default is not to exclude any channels
|
|
or nodes\. Note if the source or destination is excluded, the command result
|
|
is undefined\.
|
|
|
|
|
|
\fImaxhops\fR is the maximum number of channels to return; default is 20\.
|
|
|
|
.SH RISKFACTOR EFFECT ON ROUTING
|
|
|
|
The risk factor is treated as if it were an additional fee on the route,
|
|
for the purposes of comparing routes\.
|
|
|
|
|
|
The formula used is the following approximation:
|
|
|
|
.nf
|
|
.RS
|
|
risk-fee = amount x blocks-timeout x per-block-cost
|
|
|
|
|
|
.RE
|
|
|
|
.fi
|
|
|
|
We are given a \fIriskfactor\fR expressed as a percentage\. There are 52596
|
|
blocks per year, thus \fIper-block-cost\fR is \fIriskfactor\fR divided by
|
|
5,259,600\.
|
|
|
|
|
|
The final result is:
|
|
|
|
.nf
|
|
.RS
|
|
risk-fee = amount x blocks-timeout x riskfactor / 5259600
|
|
|
|
|
|
.RE
|
|
|
|
.fi
|
|
|
|
Here are the risk fees in millisatoshis, using various parameters\. I
|
|
assume a channel charges the default of 1000 millisatoshis plus 1
|
|
part-per-million\. Common to_self_delay values on the network at 14 and
|
|
144 blocks\.
|
|
|
|
|
|
.SH RECOMMENDED RISKFACTOR VALUES
|
|
|
|
The default \fIfuzz\fR factor is 5%, so as you can see from the table above,
|
|
that tends to overwhelm the effect of \fIriskfactor\fR less than about 5\.
|
|
|
|
|
|
1 is a conservative value for a stable lightning network with very few
|
|
failures\.
|
|
|
|
|
|
1000 is an aggressive value for trying to minimize timeouts at all
|
|
costs\.
|
|
|
|
|
|
The default for \fBlightning-pay\fR(7) is 10, which starts to become a major
|
|
factor for larger amounts, and is basically ignored for tiny ones\.
|
|
|
|
.SH RETURN VALUE
|
|
|
|
On success, a "route" array is returned\. Each array element contains
|
|
\fIid\fR (the node being routed through), \fImsatoshi\fR (the millisatoshis
|
|
sent), \fIamount_msat\fR (the same, with \fImsat\fR appended), and \fIdelay\fR (the
|
|
number of blocks to timeout at this node)\.
|
|
|
|
|
|
The final \fIid\fR will be the destination \fIid\fR given in the input\. The
|
|
difference between the first \fImsatoshi\fR minus the \fImsatoshi\fR given in
|
|
the input is the fee\. The first \fIdelay\fR is the very worst case timeout
|
|
for the payment failure, in blocks\.
|
|
|
|
.SH AUTHOR
|
|
|
|
Rusty Russell \fI<rusty@rustcorp.com.au\fR> is mainly responsible\.
|
|
|
|
.SH SEE ALSO
|
|
|
|
\fBlightning-pay\fR(7), \fBlightning-sendpay\fR(7)\.
|
|
|
|
.SH RESOURCES
|
|
|
|
Main web site: \fIhttps://github.com/ElementsProject/lightning\fR
|
|
|
|
|